Coaster-brake.



No. 856.532. PATENTED JUNE 11, 190'7.y

' A. LARSEN.

coAsTER BRAKE; APPLIOATION FILED JULY 10. 1808.

l UNITED STATES lANDERS LARSEN,

PATENT OFFICE.

oF oDENsE, DENMARK, AssIGNoR To JAMES PETER LARsoN, or BALDWIN, WISCONSIN. f

t COASTER-BRAKE.

Specification of Letters Patent.

Patent-ea Jimen, 1907.

Application filed July 10, 1906. Serial No. 825,432.

To all whom it may concern.'

Be it known that I ANDERS LARSEN, a subject of the King of Denmark, residing at Odense, in the Kingdom of Denmark, have invented certain new and useful lmprovements in Coaster-Brakes, of which the following is a specification, reference being had to the accompanying drawing.

My invention relates to improvements in coaster brakes, and the object of my inventionis to provide a coaster brake made up of few parts, 'simple in operation and comparatively cheap in manufacture. Y

.In the drawings illustrating the principle of my invention and the best mode now known to me of applying that principle, Figure l is a central longitudinal sectional view of my new coaster brake; Fig. 2 is a detail showing the driving screw; Fig. 3 is a detail showing the clutch members; Fig. 4 is a detail end view of a clutch member; and Fig. 5 is a detail showing the key for the locking device.

The axle-bar a supports the rear fork of the bicycle (not shown) and is formed with Vthreaded ends b upon which are screwed axle adjusting cones c. Mounted free to rotate upon the axle-bar is a driving screw d the outer end of which is recessed and thereby adapted to receive one of the axle adjusting cones c between which and the base of the driving screw are mounted balls e in order to reduce the friction. The shank fof the driving `screw d is formed on its exterior with a male' thread g adapted to engage a thread formed in the c lindrical wall of the central opening of the riving clutch h which is thus made to travel by the rotation of the driving screw d along the axle-bar a, or from end to end of the hub-shell fi. Screwed into the hub-Shelli is the hub-carried clutch j against the outer end of which the flange lc on the base of the driving screw d rubs or takes a bearing and between which and the conical part m of the base are mounted balls to-form a ball bearing for the driving screw d. The latter is driven by the s rocket n which is ,screwed up against the ange or shoulder k and held in place by the lockmg'nut o. 5o

The axle-bar a and the axle adjustingcones c remain stationary, while the driving screw d is rotated by the s rocket wheel n; andrelativerotatorymotionb p ing screw d and the driving clutch h causes etween the driv-l the latter to move longitudinally along the threaded portion of the driving screw d, `as will be readily understood by all skilled in the art. Forward. movement of the sprocket n tends to cause the driving clutch to a preach the hub-carried clutch y' until finally the teeth 7) engage, when rotatory motion will be communicated to the hub-shell i, thereb f driving the rear wheel (not shown) forwar The bicycle being thus driven forward and it ybeing the desire of the rider to coast, he holds the sprocket n stationary, thereby stopping the rotation of the driving screw d'. 'Ihe continued rotation of the hub -shcll i, causes relative rotatory motion between the driving clutch h and the driving screw d with the result that the former is disengaged from the hub-carried clutch j when it remains at rest upon the now motionless driving screw d. At the other end of the hub-shell t' and'secured thereto is a brake-disk q formed with arecess in its outer face between which and the axle adjusting-cone c are mounted balls e to form the customary ball bearing. The inner face of the hub-mounted brake-disk q is beveled and is thereby adapted to fit into the recess 1" formed in one of the faces of the slidable and non-rotatable brake-disk s'the other face of which is vprovided with teeth t adapted to engage the teeth t formed upon the o posed face of the driving clutch h. The s idable non-rotary or axle brake-disk s' is mounted free to slide upon the squared portion u of the axle-bar a but is otherwise stationary since the axle-bar itself is stationary, as before explained. A coil spring c tends to force the two brake-disks q, s a art, while a sto ,-,key w limits the travel o the axle brake-r isk s toward the driving clutch h. When it is desired to ap ly the brake to -decrease the speed of t e bicycle, the sprocket n is rotated toward the rear (or counter-clockwise), thereby causing the driving clutch h to a preach the slidable axle brake-disk s and ultimately to force the latter against the tension of the spring c into frictlonal contact with the rotary hub-carried.

screw z is forced against the driving c lutch hafter the latter has been engagedwith the hub-carried clutch j, thereby holding the clutch h against axial movement. The b1- l cycle is then operated asif equipped with the ordinary driving mechanism,

With the brake mechanism is combined a locking attachment the construction4 and o eration of which are as follows: To the hu shell 'i is secured a box 2 in which is slidably mounted a plate 8 formed with an inclined slot 4 in which engages the cross-piece 5 of a T-shaped locking pin 6 the shank 7 of which rojects inwardly through the hub-shell 't formed with a slot 8 for this pur ose. In the rim or fiange 9 of the hub-Shel is rotatably mounted a driving screw 10 which envages a threaded socket 11 in one end of the s idable frame or plate 3. The screw' 10 is provided with the collars 12 which prevent any lengthwise movement of the screw in either ldirection and limit the motion of the screw to a rotary motion in its bearing inthe rim or flange 9. vWhile the lateral walls of the box 2 are not shown, it will be readily understood that they are formed with vertical slots in which ride the ends of the cross-piece 5'. To lock the bicycle so that it cannot be ridden, the screw 10 is turned by means of the key 13 (Fi `5) so as'to draw the plate 3 to the right in ig. 1, thus forcing the pin 7 against the slidable non-rotary axle-mounted brake-disk s and locking or securing the hub-shell to the axle. IThis prevents the rotation of the hubshell 'i and so of the rear wheel (not shoWn).- It vn'll be understood that the inventionv herein .before described is entirely independent of the particular means used to rotate the driving screw d. My new coaster brake is equally applicable to a chain driven wheel as to a gear-driven or chainless wheel.

'driving screw; a pair of clutch members, ene

suesa WhtIclaimis:

1. The combination in a coaster-brake of an axle-bar formed with a squared hub-shell free to rotate therearoun a clutch member secured to said hub\sdhell at one end thereof; a brake-,disk `secure to said hbshell at the other end thereof; a driving screw extending Within said hub-shell and mounted 5 .5'

free to rotate u on said axle-bar; a second clutch memberl ormed with threads which engage the-threads upon said driving screw in means and stop key; and a' air of similar.

axe adjusting cones, one at eac end of said axle-bar.

2. The combinationina coaster brake of an axle-bar; a driving screw'mounted thereon; a

hub-shell free to rotate relativelytoA said of which is mounted fastupon said hub-shell and the other of which is mounted upon said screw and means operable from outside said hub-shell for holding said clutch members in engagement with eachother, said means being independent of said screw.

3. The combination in a coaster brake of a stationary axle-bar; a hub-shell mounted free to rotate thereal'ound;` a non rotary disk mounted on said axle-bar; a locking-pin carwithout the same for forcing'sai locking-pin into engagement with said non-rotary disk.

Witnesses A. BoNNEsnN, O. WESTERGAARD.

ried by said hub-shell; and mechanism --car ried by said hub shell and o erable from' i ANDERS 'LARSEN v 

